                   cluster-unique
                   {:image_id current-coreos-ami
                    :instance_type "m4.large"
-                   :sgs (mapv cluster-unique ["master-security-group" "admin-security-group"])
+                   :sgs (concat (mapv cluster-unique ["master-security-group" "admin-security-group"])
+                                [(vpc-unique "sends_gelf")])
                    :role (cluster-unique "master-role")
                    :public_ip true
                    :tags {:Key "role"

                  cluster-unique
                  {:image_id current-coreos-ami
                   :instance_type "m4.large"
                   :sgs (mapv cluster-unique ["public-slave-security-group"])
                   :role (cluster-unique "slave-role")
                   :public_ip true
                   :tags {:Key "role"

                  cluster-unique
                  {:image_id current-coreos-ami
                   :instance_type "m4.large"
                   :sgs [(cluster-unique "slave-security-group")
                         (vpc-unique "sends_gelf")]
                   :role (cluster-unique "slave-role")
                   :tags {:Key "role"
                          :PropagateAtLaunch "true"
